If you are asking about the technical "features" of a SubsPlease file, they are known for:
While "feature" isn't a standard technical term used by the group, you might be referring to one of these common aspects of their releases: 1. Episode Details (The "Featured" Content)
Many fans noted that this specific episode had to from the original manga to fit Carol and Misaki’s entire arc into one cohesive story, which was a point of heavy discussion on Reddit at the time of release.
Episode 9, titled , is a major turning point for the show's side characters.